I agree and it would take up a lot of space. I bring tubes for people who can't ski or wakeboard. At least I can fold those up and tuck them away easily. The zup seems like it would be similar to a moped. They are fun but you don't want to be seen on one.

I learned to feel comfortable in the water on something like this. When we were kids, my Dad attached a wood dowel to a bit of rope and attached that to a 2'x4' sheet of plywood. The tow rope hooked on under the front of the plywood and dragged it like a sled. It was excellent to teach us kids it's not the end of the world if you fall in the water. You could sit, stand, cut, go backwards... Whatever you were brave enough for. After a couple weeks, the skis came out and the board was put away.

I see a market with this, but like a razor scooter... It's for the kids. I absolutely detest tubes, but I can't help but laugh when I take kids out. If it makes them happy, I'm happy. A day at the lake in the sunshine, with everyone having fun, beats a -28 pass with two other people any day.